What is the CSS Minifier?
Minify CSS by removing comments and unnecessary whitespace. Minifying CSS removes comments and extra whitespace to reduce file size, which helps pages load faster.
How to use the CSS Minifier
- Paste or type your your text into the box (a sample is pre-filled so you can see how it works).
- Results update automatically as you type; you can also press Calculate.
- Read the output: result, size reduction.
- Use the 📊 chart to see the result visually, then copy or share it.
Worked example
With the sample input, the CSS Minifier returns size reduction: 37.5%.
Where the CSS Minifier helps in real life
You are preparing a small website for launch and want faster loading. Minifying the stylesheet reduces the bytes sent to every visitor.
A developer embeds critical CSS inline in the page head and wants it as compact as possible.
Common mistakes to avoid
- Editing minified files directly.
- Minifying without testing the result.
- Removing comments that contain licenses.
- Forgetting to update cache-busting file names.
💡 Practical tip: Minification and server compression work together — use both for the smallest transfer size.
Tips for better results
- Keep a readable source version.
- Test pages after minifying.
- Combine minification with compression on the server.
Frequently asked questions
What does the CSS Minifier do?
Minify CSS by removing comments and unnecessary whitespace.
Can you show an example?
With the sample input, the CSS Minifier returns size reduction: 37.5%.
Is the CSS Minifier accurate?
Yes. It uses standard formulas and exact constants, and the results are verified by our automated test suite. Values are displayed to up to 12 significant digits.
Is this tool free and private?
Yes — the CSS Minifier is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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